Axur, re d'Ormus is an operatic dramma tragicomico in five acts by Antonio Salieri. The libretto was by Lorenzo Da Ponte. Axur is the Italian version of Salieri's 1787 French-language work Tarare which had a libretto by Beaumarchais. Wikipedia
Composer: Antonio Salieri
Librettists: Lorenzo Da Ponte and Pierre-Augustin Caron de Beaumarchais